Exelon Energy Delivery Confidential – All Rights Reserved 

[COMPANY C] Administrative Procedure Gas Leakage Surveys GO-PE-104

Rev. 0

Effective:10-29-2004 

(Supersedes M-G-511)

Level: 3

Review Type: XXXX

Page 1 of 8 

1 PURPOSE

1.1 To provide criteria for conducting natural gas leakage surveys. 

1.2 To ensure compliance with Code of Federal Regulations 49 CFR 192.706, 

192.723 and Pennsylvania Utility Commission (PUC) Code 59.33. 

1.3 Section 6 has been divided into the following subsections: 

Subsection Title Page 

6.1 Frequency of Gas Leakage Surveys 4 

6.2 Type of Gas Leakage Surveys 5 

2 TERMS AND DEFINITIONS

2.1 Business Districts

2.1.1 Business Districts are the principle business areas in an urban community. In 

determining business districts, the following areas should be considered. 

1. The general public regularly congregates for economic, industrial, religious, 

educational, health or recreational purposes. 

2. The majority of the buildings on either side of the street are utilized for 

commercial, industrial, religious, educational, health or recreational 

purposes. 

3. Gas facilities are under continuous paving that extends either from the 

centerline of the thoroughfare to the building wall or from the main to the 

building wall. 

4. Any other location or site that, in the judgment of the operator, should be 

so designated. 

2.2 Distribution Pipeline
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2.2.1 A pipeline owned by [COMPANY C] Energy and operated at a pressure of 99 

PSIG or less AND less than 20 percent of the SMYS. 

2.3 Service Line

2.3.1 A pipeline that transports gas from a common source of supply to: 

1. A customer meter or connection to a customer’s piping, whichever is 

farther downstream OR

2. The connection to a customer’s piping if there is no customer meter. 

2.4 Special One-time Surveys

2.4.1 Special one-time surveys should be considered following exposure of the pipeline 

to unusual stresses including; but not limited to: 

1. When gas main pressure is being changed 

2. When sewer, water, or other major foreign underground construction has 

occurred 

a Survey should be conducted prior to re-paving 

3. Areas where blasting has occurred 

2.5 SMYS: Specified Minimum Yield Strength 

2.6 Transmission Line

2.6.1 A pipeline owned by [COMPANY C] Energy and operates at pressures of 100 

PSIG or more AND greater than 20 percent of the SMYS. 

3 RESPONSIBILITIES

3.1 Gas Corrosion / Leak Survey & Regulatory Personnel

3.1.1 Survey natural gas transmission pipelines, distribution mains, and service lines in 

accordance with this procedure. 

1. Classify leaks in accordance with GO-PE-541-801-Classification of Natural 

Gas Leaks. 

2. Record leak number in accordance with OP-X-504-Procedure for Handling 

and Recording Outside Leaks. 
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Exelon Energy Delivery Confidential – All Rights Reserved 

3. Complete Leakage Indication Report in accordance with M-X-229-100-

Leakage Indication Report Completion Instructions. 

3.1.2 Re-survey Class Type 3 and 4 leaks. 

3.1.3 Forward completed Leakage Indication Reports for transmission pipelines to Gas 

Engineering. 

3.1.4 Forward completed Leakage Indication Reports for distribution mains Gas 

Construction & Maintenance. 

3.2 Retain Pipe Inspection / Leak Repair Reports for distribution mains for the life of 

the facility. 

3.3 Gas Construction & Maintenance Personnel

3.3.1 Re-survey and re-classify Class Type 1 and 2 leaks on transmission pipelines and 

distribution mains. 

1. Classify leaks in accordance with GO-PE-541-801-Classification of Natural 

Gas Leaks. 

2. Record leak number in accordance with OP-X-504-Procedure for Handling 

and Recording Outside Leaks. 

3. Complete Leakage Indication Report in accordance with M-X-229-100-

Leakage Indication Report Completion Instructions. 

3.3.2 Forward completed Leakage Indication Reports and Pipe Inspection / Leak Repair 

Reports for transmission pipelines to Gas Engineering. 

3.3.3 Retain completed Leakage Indication Reports for distribution mains for a period of 

three (3) years. 

3.3.4 Forward completed Pipe Inspection / Leak Repair Report for distribution mains to 

Gas Corrosion / Leak Survey & Regulatory. 

3.3.5 Enter all leak indication and repair data into the Leak Tracking Data Base. 

3.4 Gas Engineering

3.4.1 Retain all Leakage Indication Reports and Pipe Inspection / Leak Repair Reports 

for transmission pipelines for the life of the facility. 
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Exelon Energy Delivery Confidential – All Rights Reserved 

4 PRECAUTIONS AND LIMITATIONS

4.1 PRECAUTIONS

4.1.1 None 

4.2 LIMITATIONS

4.2.1 None 

5 PREREQUISITES

5.1 None 

6 PROCEDURE

6.1 Frequency of Gas Leakage Surveys

6.1.1 Transmission pipelines shall be surveyed at intervals not exceeding 15 months, 

but at least once each calendar year. 

6.1.2 Distribution mains shall be surveyed on the basis of probability of gas leakage 

and shall be scheduled as follows: 

1. Coated cathodically protected steel mains and plastic mains shall be 

surveyed at intervals not exceeding 63 months, but at least once every five 

(5) calendar years. 

2. Bare steel and unprotected coated steel mains with no history of leakage 

shall be surveyed at intervals not exceeding 39 months, but at least once 

every three (3) years. 

3. The following mains shall be surveyed at intervals not exceeding 15 

months, but at least once every calendar year. 

a Mains in business districts, regardless of pipe material 

b Cast iron mains 

c Once cathodically protected bare steel mains 

d Bare steel and unprotected coated steel mains not included in 

6.1.2.2 
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Exelon Energy Delivery Confidential – All Rights Reserved 

6.1.3 Service lines shall be surveyed on the basis of probability of gas leakage and 

shall be scheduled at follows: 

1. Coated cathodically protected steel line services and plastic line services 

shall be surveyed at intervals not exceeding 63 months, but at least once 

every five (5) calendar years. 

2. Bare steel, unprotected coated steel, and copper line services shall be 

surveyed at intervals not exceeding 39 months, but at least once every 

three (3) years. 

3. Service lines in business districts, regardless of pipe material, shall be 

surveyed at intervals not exceeding 15 months, but at least once every 

calendar year. 

6.2 Type of Gas Leakage Surveys

6.2.1 Type of survey used is dependent on the physical characteristics of the area 

surveyed. 

6.2.2 Equipment used to conduct a survey is dependent on type of survey. 

6.2.3 There are four (4) types of gas leakage survey as follows: 

1. Mobile Survey is conducted along transmission pipelines and distribution 

mains that are outside of walking areas but accessible to a vehicle. 

a Mobile surveys should be conducted using high sensitivity gas 

detection equipment mounted in a vehicle. 

2. Walking Survey is conducted along transmission pipelines and distribution 

mains and services where mobile surveys are ineffectual, such as but not 

limited to: Business Districts, Heavy Traffic Areas, Right-of-ways, 

Apartment Complexes, and Shopping Areas. 

a Walking Survey shall be conducted using portable high sensitivity 

gas detection equipment. 

b Walking Survey shall include sample test of the atmosphere in gas, 

electric, telephone, sewer, and water system manholes, cracks in 

pavement and sidewalks, at other locations providing an opportunity 

for locating potential gas leaks and at building wall lines in business 

district (wall-to-wall) paved areas. 

3. Service Line Survey is conducted as a Walking Survey and includes 

walking the area over the gas service line from the gas main to the building 

line. 
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Exelon Energy Delivery Confidential – All Rights Reserved 

a Service Line Survey is conducted with a portable, high sensitivity 

gas detector. 

b Service Line Survey shall include, in addition to test sampling over 

the service line, a visual inspection of the meter, regulator vent line, 

service riser valve, and any construction over the service. 

c IF a hazardous OR potentially hazardous condition is detected, 

THEN the building SHALL be entered and surveyed. 

d Any unsatisfactory condition shall be referred to the appropriate Gas 

Construction & Maintenance supervisor. 

4. Special One-time Survey is conducted when a transmission pipeline or 

distribution main or service line has been exposed to unusual stresses. 

a Special One-time Surveys shall be conducted using high sensitivity 

gas detection equipment appropriate to site conditions. 

7 DOCUMENTATION

7.1 Leakage Indication Reports and Pipe Inspection / Leak Repair Reports for 

transmission pipelines shall be retained for the life of the facility. 

7.2 Pipe Inspection / Leak Repair Reports for distribution mains shall be retained for 

the life of the facility. 

7.3 Leakage Indication Reports for distribution mains for shall be retained three (3) 

years. 

8 REFERENCES

8.1 SUPERCEDES M-G-511-PROCEDURE FOR GAS LEAKAGE SURVEYS 

8.2 Supersedes Gas Instruction Letter, Mains & Services, Mains, Leaks 4-2, Gas 

Leak Surveys. 

8.3 Supersedes Gas Instruction Letter, Mains & Services, Services, Maintenance 5-2, 

Residential and Commercial Customer-Owned Underground Fuel Lines. 

8.4 Supersedes Distribution Foreman’s Manual, III-B-3, Residential and Commercial 

Customer-Owned Underground Fuel Lines. 

8.5 Supersedes Utilization Reference Manual, II-B-I, Residential and Commercial 

Customer-Owned Underground Fuel Lines. 
 GO-PE-104 

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8.6 Code of Federal Regulations 49CFR 192.706 

8.7 Code of Federal Regulations 49CFR 192.723 

8.8 PUC Code 59.33 

8.9 Code of Federal Regulations Guide Material Appendix G-192-11 (Natural Gas). 

8.10 Gas Procedure GO-PE-541-801-Classification of Natural Gas Leaks. 

8.11 Gas Procedure OP-X-504, Procedure for Handling and Recording Outside Leaks. 

8.12 Gas Procedure M-X-229-100-Leakage Indication Report Completion Instructions. 

9 ATTACHMENTS

9.1 None 
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10 DEVELOPMENT HISTORY

Revision 0 Date 10/15/2004

Writer William Nuss (Gas Engineering) 

Reviewer(s) Frank Dougherty (Gas Corrosion/Leak Survey & 

Regulatory); Edward Donegan (Gas Construction & 

Maintenance) 

Approver(s) Robert Baxley (Manager, Gas Construction & Maintenance), 

Timothy Flanagan (Manager, Gas Methods & Training), 

John Frantz (Manager, Gas Engineering), Nicole LeVine 

(Manager, Gas Corrosion/Leak Survey & Regulatory 

Reason Written Updated organizational names and re-formatted in 

accordance with the Exelon Management Model. Added 

additional classes of main leakage survey and leak survey 

intervals. Added clarity regarding retention of LIR and PILR 

data. THIS PROCEDURE SUPERCEDES M-G-511. 

Revision 1 Date XX/XX/XXXX

Writer Writer’s Name (work group) [text will wrap as necessary for 

all lines in table] 

Reviewer(s) Reviewer’s Name (work group); Reviewer’s Name (work 

group) 

Approver(s) Approver’s Name(s) 

Reason Written Brief description explaining why the procedure was written 

or revised. 

Revision 2 Date XX/XX/XXXX

Writer Writer’s Name (work group) [text will wrap as necessary for 

all lines in table] 

Reviewer(s) Reviewer’s Name (work group); Reviewer’s Name (work 

group) 

Approver(s) Approver’s Name(s) 

Reason Written Brief description explaining why the procedure was written 

or revised.